converting from conv2 to fft2
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Does any one knows how to convert the following code into 2D and 3D version?
if true
% 1D algorithm
x = rand(1e5,1);
y = rand(1e5,1);
tic, z1 = conv(x,y); toc
n = length(x) + length(y) - 1;
tic, z2 = ifft(fft(x,n) .* fft(y,n)); toc
disp(max(abs(z1-z2)./abs(z1)))
% 2D algorithm with 'same'
x = rand(1e4,1e4);
y = rand(1e2,1e2);
tic, z1 = conv2(x,y,'same'); toc
n = length(x) + length(y) - 1;
tic, z2 = ifft2(fft2(x,n) .* fft2(y,n)); toc
disp(max(abs(z1-z2)./abs(z1)))
% 3D algorithm with 'same'
x = rand(1e3,1e3,1e3);
y = rand(1e2,1e2,1e2);
tic, z1 = convn(x,y,'same'); toc
n = length(x) + length(y) - 1;
tic, z2 = ifftn(fftn(x,n) .* fftn(y,n)); toc
disp(max(abs(z1-z2)./abs(z1)))
end
0 Kommentare
Antworten (0)
Siehe auch
Kategorien
Mehr zu Fourier Analysis and Filtering finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!